Display device including cover layer, electronic devices and cover layer for display devices

Abstract

Provided herein are a cover layer for display devices: including a window layer; a first cover layer on the window layer; and a second cover layer on the first cover layer. The first cover layer may include silicon oxide (SiOx) having a first packing density. The second cover layer may include silicon oxide having a second packing density different from the first packing density. The first cover layer and the second cover layer may be in contact with each other.

What is claimed is: 
     
         1 . A cover layer for display devices, comprising:
 a window layer;   a first cover layer on the window layer; and   a second cover layer on the first cover layer,   wherein the first cover layer comprises silicon oxide having a first packing density,   wherein the second cover layer comprises silicon oxide having a second packing density different from the first packing density, and   wherein the first cover layer and the second cover layer are in contact with each other.   
     
     
         2 . The cover layer according to  claim 1 , wherein the second packing density is in a range from about 75% to about 95% of the first packing density. 
     
     
         3 . The cover layer according to  claim 1 , wherein the silicon oxide of the first cover layer comprises silicon dioxide, and the silicon oxide of the second cover layer comprises silicon dioxide. 
     
     
         4 . The cover layer according to  claim 3 ,
 wherein the silicon dioxide of the first cover layer has a planar structure, and   wherein the silicon dioxide of the second cover layer has a columnar structure.   
     
     
         5 . The cover layer according to  claim 1 ,
 wherein the first cover layer is formed through a sputtering process, and   wherein the second cover layer is formed through an electronic-beam evaporation process.   
     
     
         6 . The cover layer according to  claim 1 ,
 wherein the first cover layer has a first thickness,   wherein the second cover layer has a second thickness,   wherein the first thickness ranges from about 5 nm to about 15 nm or ranges from about 0.1 nm to about 9 nm, and   wherein the second thickness ranges from about 68 nm to about 83 nm or ranges from about 85 nm to about 100 nm.   
     
     
         7 . The cover layer according to  claim 1 ,
 wherein the first cover layer has a refractive index in a range from 1.43 to 1.52, and   wherein the second cover layer has a refractive index in a range from 1.32 to 1.52.   
     
     
         8 . The cover layer according to  claim 1 , further comprising a third cover layer on the second cover layer,
 wherein the second cover layer and the third cover layer are in contact with each other.   
     
     
         9 . The cover layer according to  claim 8 , wherein the third cover layer is formed through thermal evaporation or electronic-beam evaporation. 
     
     
         10 . The cover layer according to  claim 8 , wherein the third cover layer comprises perfluorinated polyether. 
     
     
         11 . The cover layer according to  claim 8 , wherein the third cover layer has a thickness in a range from about 20 nm to about 30 nm. 
     
     
         12 . A cover layer for display devices, comprising:
 a window layer;   a first cover layer on the window layer, and having a first packing density and a first thickness; and   a second cover layer directly on the first cover layer, and having a second packing density and a second thickness,   wherein the first cover layer and the second cover layer comprise an identical material,   wherein the first packing density and the second packing density differ from each other, and   wherein the second thickness is greater than the first thickness.   
     
     
         13 . The cover layer according to  claim 12 ,
 wherein the first cover layer is formed through a sputtering process, and   wherein the second cover layer is formed through an electronic-beam evaporation process.   
     
     
         14 . The cover layer according to  claim 13 ,
 wherein the identical material of the first cover layer and the second cover layer comprises silicon dioxide (SiO 2 ),   wherein the second packing density is in a range from about 75% to about 95% of the first packing density,   wherein the silicon dioxide of the first cover layer has a planar structure, and   wherein the silicon dioxide of the second cover layer has a columnar structure.   
     
     
         15 . The cover layer according to  claim 14 , wherein the first cover layer has a higher refractive index than the second cover layer. 
     
     
         16 . A display device, comprising:
 a light-emitting-element layer comprising a light emitting element configured to emit light; and   a cover layer on the light-emitting-element layer,   wherein the cover layer comprises:   a window layer;   a first cover layer on the window layer; and   a second cover layer on the first cover layer,   wherein the first cover layer comprises silicon oxide (SiO x ) having a first packing density,   wherein the second cover layer comprises silicon oxide having a second packing density different from the first packing density, and   wherein the first cover layer and the second cover layer are in contact with each other.   
     
     
         17 . The display device according to  claim 16 , wherein the first cover layer is formed through a process different from a process of forming the second cover layer. 
     
     
         18 . The display device according to  claim 16 ,
 wherein the first cover layer has a first thickness,   wherein the second cover layer has a second thickness,   wherein the first thickness ranges from about 5 nm to about 15 nm or ranges from about 0.1 nm to about 9 nm, and   wherein the second thickness ranges from about 68 nm to about 83 nm or ranges from about 85 nm to about 100 nm.   
     
     
         19 . The display device according to  claim 16 ,
 wherein the first cover layer has a refractive index in a range from about 1.43 to about 1.52, and   wherein the second cover layer has a refractive index in a range from about 1.32 to about 1.52.   
     
     
         20 . The display device according to  claim 16 , further comprising a third cover layer on the second cover layer,
 wherein the second cover layer and the third cover layer are in contact with each other, and   wherein the third cover layer has a thickness in a range from about 20 nm to about 30 nm.   
     
     
         21 . An electronic device, comprising:
 a processor to provide input image data; and   a display device to display an image based on the input image data,   wherein the display device comprises: a light-emitting-element layer comprising a light emitting element configured to emit light; and a cover layer on the light-emitting-element layer,   wherein the cover layer comprises:   a window layer;   a first cover layer on the window layer; and   a second cover layer on the first cover layer,   wherein the first cover layer comprises silicon oxide (SiO x ) having a first packing density,   wherein the second cover layer comprises silicon oxide having a second packing density different from the first packing density, and   wherein the first cover layer and the second cover layer are in contact with each other.